Hello Volker,
First, do NOT use FSK mode for PSK. Use USB. FSK mode implies the use of
the MARK and SPACE jacks on the back of the rig.
Second, you will need to build an interface that uses a signal from your
RS-232 port to ground the PTT or KEY circuits (using the appropriate jacks
on the back of the rig). Several editions of the ARRL Handbook show the
schematic required, or you could spend a few bucks and pick up a commercial
interface from BuxComm, MFJ, RigBlaster, etc. Some of the commercial
interfaces have the advantages of isolation transformers and potentiometers
for ease of level adjustment so they are worth a look.
Good luck es 73,
- jgc
John Clifford KD7KGX
Heathkit HW-9 WARC/HFT-9/HM-9
Elecraft K2 #1678 /KSB2/KIO2/KBT2/KAT2/KNB2/KAF2/KPA100
Ten-Tec Omni VI/Opt1, Centaur, 238B
Alinco DR-605TQ, DJ-V5
Icom T90A
IRLP #3978
email: kd7kgx@arrl.net
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